GitLab

Gitlab 9.0 prefers "job" instead of "build" for CI variables names.
http://docs.gitlab.com/ce/ci/variables/README.html#9-0-renaming

Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>